Considering nationality when you are preparing taxes (Nonimmigrant)

Nonimmigrant is someone who seeks temporary entry to the United States for a specific purpose. A nonimmigrant visa allows a nonimmigrant to enter the United States in one of several different categories, which correspond to the purpose for which the nonimmigrant is being admitted to the United States. For example, a foreign student will usually enter the United States on an F-1 visa, a visitor for business on a B-1 visa, an exchange visitor (including students, teachers, researches, trainees, physicians, au pairs, and others) on a 

J-1 visa, a diplomat on a A or G visa, etc. The categories of nonimmigrant visas correspond exactly to the "nonimmigrant status" assigned to each nonimmigrant upon his arrival, based on the purpose for which the nonimmigrant was admitted to the United States. For example, a foreign student who enters the United States on an F-1 visa is considered to be in F-1 student status after he enters the United States; and he will remain in that status until he violates the conditions prescribed for that status, or until he changes to another nonimmigrant or immigrant status with USCIS permission, or until he leaves the United States.